/*
 * Copyright 2003,2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pluto.internal.impl;

import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import javax.portlet.ActionResponse;
import javax.portlet.PortalContext;
import javax.portlet.PortletMode;
import javax.portlet.PortletModeException;
import javax.portlet.WindowState;
import javax.portlet.WindowStateException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

import org.apache.pluto.PortletContainer;
import org.apache.pluto.descriptors.portlet.PortletDD;
import org.apache.pluto.descriptors.portlet.SupportsDD;
import org.apache.pluto.internal.InternalActionResponse;
import org.apache.pluto.internal.InternalPortletWindow;
import org.apache.pluto.spi.ResourceURLProvider;
import org.apache.pluto.spi.PortalCallbackService;
import org.apache.pluto.util.StringUtils;

public class ActionResponseImpl extends PortletResponseImpl
implements ActionResponse, InternalActionResponse {

    /**
     * Is it still allowed to invoke the method sendRedirect() ?
     */
    boolean redirectAllowed = true;

    private boolean redirected;
    private String redirectLocation;

    private Map renderParameters = new HashMap();
    private WindowState windowState = null;
    private PortletMode portletMode = null;

    private PortalCallbackService callback;
    private PortalContext context;


    public ActionResponseImpl(PortletContainer container,
                              InternalPortletWindow internalPortletWindow,
                              HttpServletRequest servletRequest,
                              HttpServletResponse servletResponse) {
        super(container, internalPortletWindow, servletRequest,
              servletResponse);
        context = container.getRequiredContainerServices().getPortalContext();
        callback = container.getRequiredContainerServices().getPortalCallbackService();
    }

//
// javax.portlet.ActionResponse
//
    public void setWindowState(WindowState windowState)
        throws WindowStateException {
        if (redirected) {
            throw new IllegalStateException(
                "it is not allowed to invoke setWindowState after sendRedirect has been called");
        }

        if (isWindowStateAllowed(windowState)) {
            this.windowState = windowState;
        } else {
            throw new WindowStateException("Can't set this WindowState",
                                           windowState);
        }
        redirectAllowed = false;
    }

    public void setPortletMode(PortletMode portletMode)
        throws PortletModeException {
        if (redirected) {
            throw new IllegalStateException(
                "it is not allowed to invoke setPortletMode after sendRedirect has been called");
        }

        // check if portal supports portlet mode
        boolean supported = isPortletModeAllowed(portletMode);


        // if porlet mode is allowed
        if (supported) {
            this.portletMode = portletMode;
        } else {
            throw new PortletModeException("Can't set this PortletMode",
                                           portletMode);
        }

        redirectAllowed = false;

    }

    public void sendRedirect(String location) throws java.io.IOException {
        if (redirectAllowed) {
            if (location != null) {
                HttpServletResponse redirectResponse = getHttpServletResponse();
                while (redirectResponse instanceof HttpServletResponseWrapper) {
                    redirectResponse = (HttpServletResponse)
                        ((HttpServletResponseWrapper)redirectResponse).getResponse();
                }

                ResourceURLProvider provider = callback.getResourceURLProvider(
                                getHttpServletRequest(),
                                getInternalPortletWindow()
                );

                if (location.indexOf("://") != -1) {
                    provider.setAbsoluteURL(location);
                } else {
                    provider.setFullPath(location);
                }
                location =
                redirectResponse.encodeRedirectURL(provider.toString());
                //redirectResponse.sendRedirect(location);
                redirectLocation = location;
                redirected = true;
            }
        } else {
            throw new java.lang.IllegalStateException(
                "Can't invoke sendRedirect() after certain methods have been called");
        }

    }

    public void setRenderParameters(Map parameters) {
        if (redirected) {
            throw new IllegalStateException(
                "Can't invoke setRenderParameters() after sendRedirect() has been called");
        }
        if (parameters == null) {
            throw new IllegalArgumentException(
                "Render parameters must not be null.");
        }
        for (Iterator iter = parameters.entrySet().iterator(); iter.hasNext();) {
            Map.Entry entry = (Map.Entry) iter.next();
            if (!(entry.getKey() instanceof String)) {
                throw new IllegalArgumentException(
                    "Key must not be null and of type java.lang.String.");
            }
            if (!(entry.getValue() instanceof String[])) {
                throw new IllegalArgumentException(
                    "Value must not be null and of type java.lang.String[].");
            }
        }

        renderParameters = StringUtils.copyParameters(parameters);

        redirectAllowed = false;
    }

    public void setRenderParameter(String key, String value) {
        if (redirected) {
            throw new IllegalStateException(
                "Can't invoke setRenderParameter() after sendRedirect() has been called");
        }

        if ((key == null) || (value == null)) {
            throw new IllegalArgumentException(
                "Render parameter key or value must not be null.");
        }

        renderParameters.put(key, new String[]{value});

        redirectAllowed = false;
    }

    public void setRenderParameter(String key, String[] values) {
        if (redirected) {
            throw new IllegalStateException(
                "Can't invoke setRenderParameter() after sendRedirect() has been called");
        }

        if (key == null || values == null || values.length == 0) {
            throw new IllegalArgumentException(
                "Render parameter key or value must not be null or values be an empty array.");
        }

        renderParameters.put(key, StringUtils.copy(values));

        redirectAllowed = false;
    }
    // --------------------------------------------------------------------------------------------
    
    // org.apache.pluto.core.InternalActionResponse implementation --------------------------------
    public Map getRenderParameters() {
        return renderParameters;
    }

    public PortletMode getChangedPortletMode() {
        return this.portletMode;
    }

    public WindowState getChangedWindowState() {
        return this.windowState;
    }

    public String getRedirectLocation() {
        return redirectLocation;
    }

    private boolean isPortletModeAllowed(PortletMode mode) {
        return isPortletModeAllowedByPortlet(mode)
               && isPortletModeAllowedByPortal(mode);
    }

    private boolean isPortletModeAllowedByPortlet(PortletMode mode) {
        PortletDD dd = getInternalPortletWindow().getPortletEntity()
            .getPortletDefinition();

        Iterator supports = dd.getSupports().iterator();
        while(supports.hasNext()) {
            SupportsDD sup = (SupportsDD)supports.next();
            Iterator modes = sup.getPortletModes().iterator();
            while(modes.hasNext()) {
                if (modes.next().toString().equalsIgnoreCase(mode.toString())) {
                    return true;
                }
            }
        }
        return false;
    }

    private boolean isPortletModeAllowedByPortal(PortletMode mode) {
        Enumeration supportedModes = context.getSupportedPortletModes();
        while (supportedModes.hasMoreElements()) {
            if (supportedModes.nextElement().toString().equalsIgnoreCase(
                (mode.toString()))) {
                return true;
            }
        }
        return false;
    }

    private boolean isWindowStateAllowed(WindowState state) {
        Enumeration supportedStates = context.getSupportedWindowStates();
        while (supportedStates.hasMoreElements()) {
            if (supportedStates.nextElement().toString().equalsIgnoreCase(
                (state.toString()))) {
                return true;
            }
        }
        return false;
    }

}